The talk begins by recapping the sixteenth lesson; to adorn oneself with the Islamic mannerisms, such as to spread the salutations, and the etiquettes with regards to travel.
Ustaadh Abu Humayd then continues with the Islamic mannerisms that one should adorn himself with, from them:
being dutiful to one's parents.
There are many narrations from the Quran and sunnah to support this command, as Allaah says:
وَقَضَىٰ رَبُّكَ أَلَّا تَعْبُدُوا إِلَّا إِيَّاهُ وَبِالْوَالِدَيْنِ إِحْسَانًا ۚ إِمَّا يَبْلُغَنَّ عِنْدَكَ الْكِبَرَ أَحَدُهُمَا أَوْ كِلَاهُمَا فَلَا تَقُلْ لَهُمَا أُفٍّ وَلَا تَنْهَرْهُمَا وَقُلْ لَهُمَا قَوْلًا كَرِيمًا
“And your Lord has decreed that you worship none but Him. And that you be dutiful to your parents. If one of them or both of them attain old age in your life, say not to them a word of disrespect, nor shout at them but address them in terms of honour.” (Sura Al-Isra', Ayah 23)
There are many more benefits discussed, such as Islamic mannerisms with regards to clothing and to console someone who has a relative. For more in-depth notes, please visit learnaboutislam.co.uk